package com.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;

public class HttpUtil {
	/** 
     * 发送GET请求 
     *  
     * @param url 
     *            目的地址 
     * @param parameters 
     *            请求参数，Map类型。 
     * @return 远程响应结果 
     */  
    public static String sendGet(String url, Map<String, String> parameters,String charSet) { 
    	String result="";
        BufferedReader in = null;// 读取响应输入流  
        StringBuffer sb = new StringBuffer();// 存储参数  
        String params = "";// 编码之后的参数
        try {
        	// 编码请求参数  
            if(parameters.size()==1){
                for(String name:parameters.keySet()){
                    sb.append(name).append("=").append(
                            java.net.URLEncoder.encode(parameters.get(name),charSet));
                }
                params=sb.toString();
            }else{
                for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),charSet)).append("&");  
                }  
                String temp_params = sb.toString();  
                if(temp_params.length()!=0){
                	params = temp_params.substring(0, temp_params.length() - 1);  
                }
            }
            String full_url = url + "?" + params; 
            System.out.println(full_url); 
            // 创建URL对象  
            java.net.URL connURL = new java.net.URL(full_url);  
            // 打开URL连接  
            java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL  
                    .openConnection();  
            // 设置通用属性  
            httpConn.setRequestProperty("Accept", "*/*");  
            httpConn.setRequestProperty("Connection", "Keep-Alive");  
            httpConn.setRequestProperty("User-Agent",  
                    "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");  
            // 建立实际的连接
            httpConn.setConnectTimeout(60000); //超时时间60秒
            httpConn.connect();  
            // 响应头部获取  
            Map<String, List<String>> headers = httpConn.getHeaderFields();  
            // 遍历所有的响应头字段  
            for (String key : headers.keySet()) {  
                System.out.println(key + "\t：\t" + headers.get(key));  
            }  
            // 定义BufferedReader输入流来读取URL的响应,并设置编码方式  
            in = new BufferedReader(new InputStreamReader(httpConn  
                    .getInputStream(), charSet));  
            String line;  
            // 读取返回的内容  
            while ((line = in.readLine()) != null) {  
                result += line;  
            }  
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {  
                if (in != null) {  
                    in.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
        }
        return result ;
    }  
  
    /** 
     * 发送POST请求 
     *  
     * @param url 
     *            目的地址 
     * @param parameters 
     *            请求参数，Map类型。 
     * @return 远程响应结果 
     */  
    public static String sendPost(String url, Map<String, String> parameters,String charSet) {  
    	 String result = "";// 返回的结果  
         BufferedReader in = null;// 读取响应输入流  
         PrintWriter out = null;  
         StringBuffer sb = new StringBuffer();// 处理请求参数  
         String params = "";// 编码之后的参数  
         try {  
             // 编码请求参数  
             if (parameters.size() == 1) {  
                 for (String name : parameters.keySet()) {  
                     sb.append(name).append("=").append(  
                             java.net.URLEncoder.encode(parameters.get(name),charSet));  
                 }  
                 params = sb.toString();  
             } else {  
                 for (String name : parameters.keySet()) {  
                     sb.append(name).append("=").append(  
                             java.net.URLEncoder.encode(parameters.get(name),charSet)).append("&");  
                 }  
                 String temp_params = sb.toString();  
                 params = temp_params.substring(0, temp_params.length() - 1);  
             }  
             // 创建URL对象  
             java.net.URL connURL = new java.net.URL(url);  
             // 打开URL连接  
             java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL  
                     .openConnection();  
             // 设置通用属性  
             httpConn.setRequestProperty("Accept", "*/*");  
             httpConn.setRequestProperty("Connection", "Keep-Alive");  
             httpConn.setRequestProperty("User-Agent",  
                     "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");  
             // 设置POST方式  
             httpConn.setDoInput(true);  
             httpConn.setDoOutput(true);  
             // 获取HttpURLConnection对象对应的输出流  
             out = new PrintWriter(httpConn.getOutputStream());  
             // 发送请求参数  
             out.write(params);  
             // flush输出流的缓冲  
             out.flush();  
             // 定义BufferedReader输入流来读取URL的响应，设置编码方式  
             in = new BufferedReader(new InputStreamReader(httpConn  
                     .getInputStream(), charSet));  
             String line;  
             // 读取返回的内容  
             while ((line = in.readLine()) != null) {  
                 result += line;  
             }  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            try {  
                if (out != null) {  
                    out.close();  
                }  
                if (in != null) {  
                    in.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
        }  
        return result;  
    }  
}
